Bill,
there was no 930 for US in 1975, and only 284 of them were built for ROW.
At 1140kgs, they are the lightest turbo ever built, and there are small differences from 76 ones:
Exterior: one non-electric mirror and no stone guards, no zinc protection on body
Interior: dash and door panels as 75 carreras, with speaker grille (like pre-bumper ones).
Here are a few photos from period literature:
In Europe, values are higher than later 930s, one very early one (Vin #0020) was for sale last year for 50k Euros needing restoration, and there is one for sale in France at 60k euro.
http://www.classicdriver.com/uk/find/4100_results.asp?bsubmit=true&lmodelflag=12160&lma nufacturer=10106&whatbutton.x=0&page=0&lCarID=1774 227
regards,
Andrea